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Macro and micronuclei are the characteristic feature of:

1. Paramecium and Vorticella
2. Opalina and Noctilucus
3. Hydra and Ballantidium
4. Vorticella and Noctilucus

Correct answer: Paramecium and Vorticella

Solution

Paramecium and Vorticella are ciliates that characteristically possess two types of nuclei: a macronucleus for everyday cellular functions and a micronucleus for reproduction. This dual-nucleus arrangement is a hallmark of many ciliates.

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